Aggregator

Log Number: 4408210Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Yoon
DATE:             06/29/2025
SHIFT:               Swing

The operator has read the following:

• ELOG
• PD Shift Plan
• Radiation Surveys for PSS Segments in Controlled Access
• PSS Log

Log Number: 4408182Logbook(s): 

• ELOG
• LERFLOG

Body: 
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM

Date : 06-29-25
Time : 14:48:31
Day : Sunday
Shift : Swing

Crew Chief : Richardson
Program Deputy: Nissen
Team : X
Arm : Shriner
Designated SSO: Yoon
LERF Operator:
Operators : Yoon, Shriner

This stamp certifies that the above Crew Chief has read/reviewed/received the following:

Log Number: 4408176Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: Beam to xABCD.

Log Number: 4408174Logbook(s): 

• ELOG

Tags: 

• BeamAccounting

Body:  Accelerator PHYSICS STUDIES RESTORE ACC DOWN OFF (SAM) Planned 8 0 0

Log Number: 4408173Logbook(s): 

• ELOG

Entry Makers: alexsBody: 

Ran through the rest of 1L23 to check for new field emitters after the down overnight

Neutron dose reduction for 0.5 MV/m GSET reduction
Cavity 1: <0.1
2: <0.1
3: <0.1
4: 0.36
5: <0.1
6: 0.15
7: 0.42
9: 0.2

Log Number: 4408172Logbook(s): 

• HDLOG
• ELOG

Entry Makers: alexsBody: 

Log Number: 4408169Logbook(s): 

• ELOG

Body: Calibration ParametersHall:DTarget: JD80-212 80um 45/135 degPass: 5.5Note: Calibrated On:2025-Apr-30 02:58Calibrated By: janakFile:D-2025-04-30_0258_JD80-212_80um_45_135_deg_Pass-5.5.hcdIon ChamberExisting Setpoing (rads/hr)New Setpoint (rads/hr)

Log Number: 4408158Logbook(s): 

• ELOG
• RFLOG

Entry Makers: alexsBody: 

It was noted that the 1L23 NDX neutron rates jumped this morning, right around the time 1L23-8 quenched multiple times and had to be derated. Gradually adjusted the GSET, and sure enough the cavity had popped a field emitter. Derated it a further 1.3 MV/m to reduce neutron rates 2.8 rem/hr. Not quite back at previous levels, but at the 1 MV/m : 1 rem/hr limit.

Log Number: 4408149Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The OPS DRVHs for the following cavities have been updated:
1L23-8
Username: alexs
Date/Time: 06-29-25_14:14:00
RF Status: Good
Tuner Status: Good
Comment: DRVH=10.000 Derated 1.3 MV/m for 2.8 rem/hr neutron reduction
Previous OPS DRVH: 11.3
Special Instructions:

Log Number: 4408147Logbook(s): 

• ELOG

Entry Makers: alexsBody: 

BSY service building temperatures crossed the 85 F alarm threshold. Notified facilities and DC Power per alarm guidance. No change from Saturday, will continue to monitor and take action if temperatures look like they'll hit 90.

Log Number: 4408146Logbook(s): 

• ELOG

Body: 

Field Emission neutron and photon rates increased today around 3 am at the location between 1L22 and 1L23 (the NDX unit INX1L23)

Log Number: 4408136Logbook(s): 

• ELOG
• RFLOG

Entry Makers: alexsBody: 

Noticed the external transformer for 1L13 in the NLSB is radiating a significant amount of heat. Could likely use more airflow. There's a fan nearby it not currently turned on, but I didn't want to risk poking the bear on a Sunday afternoon when it could wait until Monday.

Log Number: 4408133Logbook(s): 

• ELOG

Entry Makers: alexsBody: 

Log Number: 4408127Logbook(s): 

• ELOG

Entry Makers: schoeneBody: 

Second time this has happened today. Already PR'd, just logging for tracking.

Log Number: 4408116Logbook(s): 

• ELOG

Entry Makers: schoeneBody: 

Not by much, magnet was returned to setpoint and cycled w/o fuss.

Log Number: 4408086Logbook(s): 

• HDLOG
• ELOG

Entry Makers: schoeneBody: 

Log Number: 4408085Logbook(s): 

• ELOG

Body: Calibration ParametersHall:DTarget: JD80-212 80um 0/90 degPass: 5.5Note: Calibrated On:2025-Apr-29 12:54Calibrated By: mmerzFile:D-2025-04-29_1254_JD80-212_80um_0_90_deg_Pass-5.5.hcdIon ChamberExisting Setpoing (rads/hr)New Setpoint (rads/hr)

Log Number: 4408084Logbook(s): 

• HDLOG
• ELOG

Entry Makers: schoeneBody: 

Log Number: 4408081Logbook(s): 

• ELOG

Body: ACC=>VACUUM=>WEST_ARC=>ARC8=>VIP8A26 has been disabled in alarm handler

Going in and out of alarm. Ops-PR: 4407747

Log Number: 4408058Logbook(s): 

• HBLOG
• ELOG

Entry Makers: alexsBody: